# Proposed AD FAA-2009-0236: CFM International, S.A. CFM56-7B Series Turbofan Engines

- Type: Proposed airworthiness directive (not in force)
- Status: Became AD 2010-01-05
- Products: CFM International
- Product type: Engine
- Action: Notice of proposed rulemaking (NPRM).
- Published: May 11, 2009, 74 FR 21772
- Comments due: July 10, 2009
- Became: [AD 2010-01-05](https://openairdocs.org/ad/2010-01-05)
- Docket: FAA-2009-0236 (https://www.regulations.gov/docket/FAA-2009-0236, where comments are filed)
- Project: 2009-NE-06-AD
- FR document: E9-10956
- Official PDF: https://openairdocs.org/files/sha256/4c/a4/4ca47ba6c08dff7fc3484b3c4f02818dcf91651263aa9d5887ad483a5efa0d9b (from https://www.govinfo.gov/content/pkg/FR-2009-05-11/pdf/E9-10956.pdf)
- Federal Register: https://www.federalregister.gov/documents/2009/05/11/E9-10956/airworthiness-directives-cfm-international-sa-cfm56-7b-series-turbofan-engines
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/FA477E80B6F03548862575B3005497B4.0001
- Page: https://openairdocs.org/proposed/FAA-2009-0236

## Summary

The FAA proposes to adopt a new airworthiness directive (AD) for CFM International, S.A. CFM56-7B series turbofan engines. This proposed AD would require initial and repetitive eddy current inspections (ECIs) of certain part number (P/N) low-pressure (LP) turbine rear frames. This proposed AD results from a refined life analysis by the engine manufacturer that shows the need to identify an initial and repetitive inspection threshold for inspecting certain LP turbine rear frames. We are proposing this AD to prevent failure of the LP turbine rear frame from low-cycle-fatigue cracks. Failure of the LP turbine rear frame could result in engine separation from the airplane, possibly leading to loss of control of the airplane.

## Notices in this docket

- May 11, 2009: Notice of proposed rulemaking (NPRM). (first notice), FR document E9-10956, comments due Jul 10, 2009 (https://www.federalregister.gov/documents/2009/05/11/E9-10956/airworthiness-directives-cfm-international-sa-cfm56-7b-series-turbofan-engines)

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.